Feeding mechanism for sewing-machines.



G. F. GRAY.

FEEDING MECHANISM FOR SEWING MACHINES.

APPLIGATION FILED MAY21,1909.

1,017,145, Patented Feb. 13, 1912.

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CHARLES FREDERICK GRAY, OF SIERRA MADRE, CALIFORNIA, ASSIGNOR TO THE SINGER MANUFACTURING COMPANY, A CORPORATION OF NEW JERSEY.

FEEDING MECHANISM FOR SEWING-MACHINES.

To all whom it may concern:

Be it known that I, CHARLES FREDERIoK GRAY, a citizen of the United States, residing at Sierra Madre, in the county of Los Angeles and State of California, have invented certain new and useful Improvements in Feeding Mechanism for Sewing- Machines, of which the following is a specification, reference being had therein to the accompanying drawings.

This invention relates to improvements in sewing machine devices for preventing the free ends of the sewing threads from being drawn below the throat-plate by the action of the loop-taker when commencing a seam, and for holding and feeding the sewing threads when passing from one production to another, as when chaining off, and has for its object to make more durable and less complicated the elements directly connected with the feeding operation, and to this end there is provided an integrally formed rocking cloth-presser, coacting throat-plate and multiple feed-dogs constructed and arranged so that one portion of the clothpresser coacts with one of the feed-dogs to feed the material, the remaining portion of said presser being arranged in line with and at the rear of the needle opening in the throat-plate and directly over a second feeddog operating in an opening formed in said throat-plate, said opening having its rear wall located within the feeding surface of said cloth-presser, thus providing a construction and arrangement of throat-plate and feed-dogs for preventing the free ends of the sewing threads from being drawn below the throat-plate, which permits of the employment of a one-part cloth-presser, as compared with the employment of a plurality of elements for effecting the same function, as in the earlier construction.

The single figure is a view in perspective of the improved cloth-presser, feed-dog and throat-plate, together with a portion of the sewing machine bed-plate, only so much of the cloth-presser lifting mechanism being shown as is deemed necessary for a proper understanding of the invention, such mecha-- nism in the present instance being substantially the same as that shown in U. S. Patent No. 696,012, issued Mar. 25, 1902, to G. H. Dimond & WV. F. Dial, for sewing machine cloth presser.

1 represents the cloth or bed plate of the Specification of Letters Patent.

Application filed May 21, 1909.

Patented Feb. 13, 1912.

Serial No. 497,518.

sewing machine, 2the front slide-plate, 3 the back plate, 4 the needle-bar, 5 the presserbar and 6 the auxiliary presser-bar, all of which are of ordinary construction and may be as herein pointed out or of any approved form.

7 is the cloth-presser bracket, secured by screw 8 to the auxiliary presser-bar 6, and provided with a lug 9 which enters a slot 10 formed in the presser-bar 5.

11 is a hinge-plate, secured by screw 8 to the bracket 7 and provided with a rib 12 which enters a groove 13 in said bracket, said plate being made slightly adjustable in line with the said groove through the enlargement of the hole through which the screw 8 passes.

15 is a rocking cloth-presser secured by a hinge-pin 16 to an extension 17 of the plate 11 and provided with an upturned toe 18 to facilitate the introduction of the material beneath the presser-foot.

The throat-plate 19 is secured by screws 20, 20 to the bed-plate 1 and is provided with an opening 21 for the passage of the needle, and also with an opening which comprises the sections 22 and 23 for the respective feed-dogs 24 and 25, the latter being provided with unbroken serrations to insure that the sewing threads, when chaining off, will be gripped between the under surface of said rocking cloth-presser and the upper edge of the walls comprising said serrations.

The portion of the under surface of the cloth-presser 15 which coacts with the feeddog 25 extends back over the section 23 a suflicient distance to insure that the heel 26 of said cloth-presser will at all times 00- cupy a position in vertical alinement with the solid portion of the throat-plate directly back of said section, so that when the loose ends of the sewing threads are drawn back beneath the clot-h-presser and the material is being presented to the action of the feeddog 24, such loose ends will be held securely between the heel of the clot-h-presser and the upper surface of the throat-plate, thus preventing the formation of one or more loose stitches at the commencement of the seam.

When it is desired to continue the needle actuation while passing from one piece of material to another, or while passing through an opening in the material as when darning, the feed-dog 25 coacts with the un der surface of the cloth-presser 15 to advance the interlocked threads, and the heel 26 of said presser acts to hold said threads against displacement when the feed-dog is carried below the upper surface of the throat-plate in its return movement.

' Claims:

1. Ina feeding mechanism for sewing machines, the combination of a plurality of feed-dogs having feeding surfaces of dif ferent lengths, an integrally formed rocking cloth-presser provided with feeding surfaces of different lengths, a throat-plate having openings of different lengths to accommodate the feed movements of said feed-dogs and provided with a needle opening, the feeding surface of the shortest of said feeddogs being provided with unbroken serrations arranged in a line transverse to the line of seam formation and of a length substantially that of the needle opening, the rear wall of the shortest feed-dog opening being located forward of the rear end of the shortest feeding surface of said presserfoot, the rear portion of said latter surface coacting with the upper surface of said throat-plate to hold the sewing threads against movements in the direction of said needle opening when chaining of.

2. In a feeding mechanism for sewing machines, the combination of a plurality of feed-dogs having feeding surfaces of different lengths, a cloth-presser carrying bar, an integrally formed rocking cloth-Presser adjustably mounted with respect to said bar and provided with feeding surfaces of different lengths, a throat-plate having openings of different lengths to accommodate the feed movements of said feed-dogs and provided with a needle opening, the feeding surface of the shortest of said feed-dogs being provided with unbroken serrations arranged in a line transverse to the line of seam formation and of a length substantially that of the needle opening, the rear wall of the shortest feed-dog opening being located forward of the rear end of the shortest feeding surface of said presser-foot, the rear portion of said latter surface coacting with the upper surface of said throatplate to hold the sewing threads against movements in the direction of said needle opening when chaining off.

3. In a feeding mechanism for sewing ma chines, the combination ofa plurality of feed-dogs having feeding surfaces of different lengths, a clothresser carrying bar, a cloth-presser bracket carried by said bar, an integrally formed rocking'cloth-presser carried by said bracket and provided with feeding surfaces of different lengths, a throat-plate having openings of different lengths to accommodate the feed movements of said feed-dogs and provided with a needle opening, the feeding surface of the shortest of said feed-dogs being provided with unbroken serrations arranged in a line transverse to the line of seam formation and of a length substantially that of the needle opening, the rear wall of the shortest feeddog opening being located forward of the rear end of the shortest feeding surface of said presser-foot, the rear portion of said latter surface coacting with the upper surface of said throat-plate to hold the sewing threads against movements in the direction of said needle opening when chaining off.

In testimony whereof, I have signed my name to this specification, in the presence of two subscribing witnesses.

CHARLES FREDERICK GRAY.

WVitnesses:

v CHAs. S. KERSTING,

N. H. HOSMER.

Copies 01' this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

